The current version of PL/Python functions as a trusted language
only; access to the file system and other local resources is
disabled. Specifically, PL/Python uses the Python restricted
execution environment, further restricts it to prevent the use of
the file open call, and allows only
modules from a specific list to be imported. Presently, that list
includes: array, bisect, binascii,
calendar, cmath, codecs, errno, marshal,
math, md5,
mpz, operator,
pcre, pickle,
random, re,
regex, sre,
sha, string,
StringIO, struct, time, whrandom, and zlib.